Mo–Ta system

25 accepted literature values from 3 paper(s) (experimental 20, DFT 2, unspecified 3); 6 calculated phase diagram(s). 4 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (5) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	20
DFT	2
unspecified	3

Accepted values by property group
Property group	Values
phase transition	9
phase equilibrium	11
formation	3
crystal structure	1
other property	1

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
MoTa-04Xio.tdb	W. Xiong, Y. Du, Y. Liu, B.Y. Huang, H.H. Xu, H.L. Chen, Z. Pan, Calphad, 28, 133-40(2004). doi:10.1016/j.calphad.2004.07.002	`92183b395962707869cce8b0f5f0f52504e7ad2d3f30d4fda987dad7a563dfa5`	viewer · TDB · JSON
MoTa-05Tur.tdb	P.E.A. Turchi, V. Drchal, J. Kudrnovsky, C. Colinet, L. Kaufman, Z.-K. Liu, Phys. Rev. B, 71, 094206(2005). doi:10.1103/PhysRevB.71.094206	`88917f2b0afc92ac8a6a29890a28df22294c2a19f62c51bcdbd0f4d4f6986a4d`	viewer · TDB · JSON
MoTa-20Raj.tdb	V.B. Rajkumar, Y. Du, S. Liu, K. Cheng, A.K. Srivastav, Int. J. Refract. Met. Hard Mater., 93, 105335(2020). doi:10.1016/j.ijrmhm.2020.105335	`cfa37cba21b8d3dfb2b6d542e02f6a74a8ee75aa0c9b06a8461e27a96c423fd0`	viewer · TDB · JSON
MoTa-22Zha.tdb	E. Zhang, Y. Tang, M. Wen, A. Obaied, I. Roslyakova, L. Zhang, Int. J. Refract. Met. Hard Mater., 103, 105780(2022). doi:10.1016/j.ijrmhm.2022.105780	`a89e2ac4995bb46b2d14ffdec0a3b085451c33cf2b489d463e8c4c2f19782838`	viewer · TDB · JSON
MoTa-91Kau-LB.tdb	L. Kaufman, Calphad, 15, 243-59(1991). doi:10.1016/0364-5916(91)90004-4	`7885146f2baf656fcce5145b1929f9a2bc1ae7afb70b5a5a2ec48f4d84551d8c`	viewer · TDB · JSON
MoTa-99Cui.tdb	Y.W. Cui, X.G. Lu, Z.P. Jin, Metall. Mater. Trans. A, 30, 2735(1999). doi:10.1007/s11661-999-0110-0	`1ea55690b63df718cb983c3436b519a63ebbe2ed1352444dce0c9633ccd20c66`	viewer · TDB · JSON

Convex hulls: Materials Project DFT hull · OQMD DFT hull · CALPHAD hull MoTa-04Xio · CALPHAD hull MoTa-05Tur · CALPHAD hull MoTa-20Raj · CALPHAD hull MoTa-91Kau-LB · CALPHAD hull MoTa-99Cui

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, Mo–Ta system (3)
Phase	Value	T (K)	Class	Source	Location
Mo3Ta	36.6 kJ/mol-atom		DFT	[1] Zhou 2009	Table 6, p. 7, row 36 report
Ordered B2 TaMo	-26.5 kJ/mol (basis unstated)	0	unspecified	[2] Turchi 2005	Table I, p. 5, row 12 report
Ta3Mo	32.08 kJ/mol-atom		DFT	[1] Zhou 2009	Table 6, p. 7, row 35 report

Other properties

Phase transition (9)

Phase transition, Mo–Ta system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Phase transition	3022 K	3022	other: No. 3, Mo-20 at.% Ta alloy: Mo 0.8, Ta 0.2	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 5 report
Phase transition	3027 K	3027	other: No. 2, Mo-10 at.% Ta alloy: Mo 0.9, Ta 0.1	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 3 report
Phase transition	3086 K	3086	other: No. 5, Mo-40 at.% Ta alloy: Mo 0.6, Ta 0.4	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 9 report
Phase transition	3119 K	3119	other: No. 6, Mo-50 at.% Ta alloy: Mo 0.5, Ta 0.5	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 11 report
Phase transition	3142 K	3142	other: No. 4, Mo-30 at.% Ta alloy: Mo 0.7, Ta 0.3	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 7 report
Phase transition	3172 K	3172	other: No. 7, Mo-60 at.% Ta alloy: Mo 0.4, Ta 0.6	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 13 report
Phase transition	3221 K	3221	other: No. 8, Mo-70 at.% Ta alloy: Mo 0.3, Ta 0.7	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 15 report
Phase transition	3281 K	3281	other: No. 9, Mo-80 at.% Ta alloy: Mo 0.2, Ta 0.8	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 17 report
Phase transition	3317 K	3317	other: No. 10, Mo-90 at.% Ta alloy: Mo 0.1, Ta 0.9	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 19 report

Phase equilibrium (11)

Phase equilibrium, Mo–Ta system
Property	T (K)	Phases / composition	Class	Source	Location
Phase composition	2865	other: No. 1, Mo-0 at.% Ta liquid: Mo 1, Ta 0	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 1 report
Phase composition	3047	other: No. 2, Mo-10 at.% Ta liquid: Mo 0.9, Ta 0.1	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 2 report
Phase composition	3056	other: No. 3, Mo-20 at.% Ta liquid: Mo 0.8, Ta 0.2	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 4 report
Phase composition	3092	other: No. 5, Mo-40 at.% Ta liquid: Mo 0.6, Ta 0.4	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 8 report
Phase composition	3138	other: No. 6, Mo-50 at.% Ta liquid: Mo 0.5, Ta 0.5	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 10 report
Phase composition	3155	other: No. 4, Mo-30 at.% Ta liquid: Mo 0.7, Ta 0.3	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 6 report
Phase composition	3185	other: No. 7, Mo-60 at.% Ta liquid: Mo 0.4, Ta 0.6	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 12 report
Phase composition	3235	other: No. 8, Mo-70 at.% Ta liquid: Mo 0.3, Ta 0.7	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 14 report
Phase composition	3272	other: No. 11, Mo-100 at.% Ta liquid: Mo 0, Ta 1	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 20 report
Phase composition	3298	other: No. 9, Mo-80 at.% Ta liquid: Mo 0.2, Ta 0.8	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 16 report
Phase composition	3337	other: No. 10, Mo-90 at.% Ta liquid: Mo 0.1, Ta 0.9	experimental	[3] Rajkumar 2020	Table 2, p. 5, row 18 report

Crystal structure (1)

Crystal structure, Mo–Ta system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
lattice unspecified axis printed: Lattice constant	3.2139 Å		Ordered B2 TaMo alloy: Ta 0.5	unspecified	[2] Turchi 2005	Table I, p. 5, row 12 report

Other property (1)

Other property, Mo–Ta system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
bulk modulus printed: Bulk modulus	226.7 GPa		Ordered B2 TaMo alloy: Ta 0.5	unspecified	[2] Turchi 2005	Table I, p. 5, row 12 report

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

S.H. Zhou, Y. Wang, L.-Q. Chen, Z.-K. Liu, R.E. Napolitano, Solution-based thermodynamic modeling of the Ni–Ta and Ni–Mo–Ta systems using first-principle calculations, Calphad 33, 631-641 (2009). doi:10.1016/j.calphad.2009.06.006
P. E. A. Turchi, V. Drchal, J. Kudrnovský, C. Colinet, Larry Kaufman, Zi-Kui Liu, Application of<i>ab initio</i>and CALPHAD thermodynamics to Mo-Ta-W alloys, Phys. Rev. B 71 (2005). doi:10.1103/physrevb.71.094206
V.B. Rajkumar, Yong Du, Shuhong Liu, Kaiming Cheng, Ajeet Kumar Srivastav, Measurements of the melting points, liquidus, and solidus of the Mo, Ta, and Mo Ta binary alloys using a novel high-speed pyrometric technique, International Journal of Refractory Metals and Hard Materials 93, 105335 (2020). doi:10.1016/j.ijrmhm.2020.105335

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735859
R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735891
R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0). Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}